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Showing content from https://github.com/alibaba/open-local below:

alibaba/open-local: cloud-native local storage management system for stateful workload, low-latency with simplicity

Open-Local is a local disk management system composed of multiple components. With Open-Local, using local storage in Kubernetes will be as simple as centralized storage.

Local storage pool management
Dynamic volume provisioning
Extended scheduler
Volume expansion
Volume snapshot
Volume metrics
Raw block volume
IO Throttling(direct-io only)
Ephemeral inline volume

Open-Local Feature Matrix Feature Open-Local Version K8S Version Node Disk pooling v0.1.0+ 1.18-1.20 Dynamic Provisioning v0.1.0+ 1.20-1.22 Volume Expansion v0.1.0+ 1.20-1.22 Volume Snapshot v0.1.0+ 1.20-1.22 LVM/Block Device/Mountpoints as fs v0.1.0+ 1.18-1.20 Raw Block Device(volumeMode: Block) v0.3.0+ 1.20-1.22 IO-Throttling v0.4.0+ 1.20-1.22 CSI ephemeral volumes v0.5.0+ 1.20-1.22 IPv6 Support v0.5.3+ 1.20-1.22 SPDK host device v0.6.0+ 1.20-1.22 Read-write snapshot v0.7.0+ 1.20-1.22

┌─────────────────────────────────────────────────────────────────────────────┐
│ Master                                                                      │
│                   ┌───┬───┐           ┌────────────────┐                    │
│                   │Pod│PVC│           │   API-Server   │                    │
│                   └───┴┬──┘           └────────────────┘                    │
│                        │ bound                ▲                             │
│                        ▼                      │ watch                       │
│                      ┌────┐           ┌───────┴────────┐                    │
│                      │ PV │           │ Kube-Scheduler │                    │
│                      └────┘         ┌─┴────────────────┴─┐                  │
│                        ▲            │     open-local     │                  │
│                        │            │ scheduler-extender │                  │
│                        │      ┌────►└────────────────────┘◄───┐             │
│ ┌──────────────────┐   │      │               ▲               │             │
│ │ NodeLocalStorage │   │create│               │               │  callback   │
│ │    InitConfig    │  ┌┴──────┴─────┐  ┌──────┴───────┐  ┌────┴────────┐    │
│ └──────────────────┘  │  External   │  │   External   │  │  External   │    │
│          ▲            │ Provisioner │  │   Resizer    │  │ Snapshotter │    │
│          │ watch      ├─────────────┤  ├──────────────┤  ├─────────────┤    │
│    ┌─────┴──────┐     ├─────────────┴──┴──────────────┴──┴─────────────┤GRPC│
│    │ open-local │     │                 open-local                     │    │
│    │ controller │     │             CSI ControllerServer               │    │
│    └─────┬──────┘     └────────────────────────────────────────────────┘    │
│          │ create                                                           │
└──────────┼──────────────────────────────────────────────────────────────────┘
           │
┌──────────┼──────────────────────────────────────────────────────────────────┐
│ Worker   │                                                                  │
│          │                                                                  │
│          ▼                ┌───────────┐                                     │
│ ┌──────────────────┐      │  Kubelet  │                                     │
│ │ NodeLocalStorage │      └─────┬─────┘                                     │
│ └──────────────────┘            │ GRPC                     Shared Disks     │
│          ▲                      ▼                          ┌───┐  ┌───┐     │
│          │              ┌────────────────┐                 │sdb│  │sdc│     │
│          │              │   open-local   │ create volume   └───┘  └───┘     │
│          │              │ CSI NodeServer ├───────────────► VolumeGroup      │
│          │              └────────────────┘                                  │
│          │                                                                  │
│          │                                                 Exclusive Disks  │
│          │                ┌─────────────┐                  ┌───┐            │
│          │ update         │ open-local  │  init device     │sdd│            │
│          └────────────────┤    agent    ├────────────────► └───┘            │
│                           └─────────────┘                  Block Device     │
│                                                                             │
│                                                                             │
└─────────────────────────────────────────────────────────────────────────────┘

Open-Localcontains four types of components:

Scheduler extender: as an extended component of Kubernetes Scheduler, adding local storage scheduling algorithm
CSI plugins: providing the ability to create/delete volume, expand volume and take snapshots of the volume
Agent: running on each node in the K8s cluster, initializing the storage device according to the configuration list, and reporting local storage device information for Scheduler extender
Controller: getting the cluster initial configuration of the storage and deliver a detailed configuration list to Agents running on each node

Open-Local also includes a monitoring dashboard:

Open-Local has been widely used in production environments, and currently used products include:

ACK Distro
Alibaba Cloud ECP (Enterprise Container Platform)
Alibaba Cloud ADP (Cloud-Native Application Delivery Platform)
CNStack Products
AntStack Plus Products

More details here

Before adopting open-local in production, k8s users usually want to know use cases for open-local. Please send us PR to update Use Cases with company, use case and since for wider adoption.

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